1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
18 // Event generator that using an instance of type AliGenReader
19 // reads particles from a file and applies cuts.
20 // Example: In your Config.C you can include the following lines
21 // AliGenExtFile *gener = new AliGenExtFile(-1);
22 // gener->SetMomentumRange(0,999);
23 // gener->SetPhiRange(-180.,180.);
24 // gener->SetThetaRange(0,180);
25 // gener->SetYRange(-999,999);
26 // AliGenReaderTreeK * reader = new AliGenReaderTreeK();
27 // reader->SetFileName("myFileWithTreeK.root");
28 // gener->SetReader(reader);
32 #include <Riostream.h>
34 #include "AliGenExtFile.h"
35 #include "AliRunLoader.h"
36 #include "AliHeader.h"
37 #include "AliGenEventHeader.h"
39 #include <TParticle.h>
44 ClassImp(AliGenExtFile)
46 AliGenExtFile::AliGenExtFile()
57 AliGenExtFile::AliGenExtFile(Int_t npart)
64 fTitle = "Primaries from ext. File";
67 //____________________________________________________________
68 AliGenExtFile::~AliGenExtFile()
74 //___________________________________________________________
75 void AliGenExtFile::Init()
78 if (fReader) fReader->Init();
82 void AliGenExtFile::Generate()
86 Float_t polar[3] = {0,0,0};
88 Float_t origin[3] = {0,0,0};
94 if (fVertexSmear == kPerEvent) Vertex();
97 Int_t nTracks = fReader->NextEvent();
99 // printf("\n No more events !!! !\n");
100 Warning("AliGenExtFile::Generate","\nNo more events in external file!!!\nLast event may be empty or incomplete.\n");
105 // Particle selection loop
107 // The selection criterium for the external file generator is as follows:
109 // 1) All tracks are subject to the cuts defined by AliGenerator, i.e.
110 // fThetaMin, fThetaMax, fPhiMin, fPhiMax, fPMin, fPMax, fPtMin, fPtMax,
112 // If the particle does not satisfy these cuts, it is not put on the
114 // 2) If fCutOnChild and some specific child is selected (e.g. if
115 // fForceDecay==kSemiElectronic) the event is rejected if NOT EVEN ONE
116 // child falls into the child-cuts.
117 TParticle* iparticle = 0x0;
120 // Count the selected children
122 while ((iparticle=fReader->NextParticle()) ) {
123 Int_t kf = CheckPDGCode(iparticle->GetPdgCode());
125 if (ChildSelected(kf) && KinematicSelection(iparticle, 1)) {
129 if (!nSelected) continue; // No particle selected: Go to next event
130 fReader->RewindEvent();
134 // Stack filling loop
136 for (i = 0; i < nTracks; i++) {
137 TParticle* iparticle = fReader->NextParticle();
138 Bool_t selected = KinematicSelection(iparticle,0);
139 if (!selected) continue;
140 p[0] = iparticle->Px();
141 p[1] = iparticle->Py();
142 p[2] = iparticle->Pz();
143 Int_t idpart = iparticle->GetPdgCode();
144 if(fVertexSmear==kPerTrack)
147 for (j = 0; j < 3; j++) {
148 origin[j]=fOrigin[j]+
149 fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
150 TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
153 origin[0] = fVertex[0] + iparticle->Vx();
154 origin[1] = fVertex[1] + iparticle->Vy();
155 origin[2] = fVertex[2] + iparticle->Vz();
158 Int_t decayed = iparticle->GetFirstDaughter();
159 Int_t doTracking = fTrackIt && (decayed < 0) && (TMath::Abs(idpart) > 10) && selected;
160 Int_t parent = iparticle->GetFirstMother();
162 PushTrack(doTracking,parent,idpart,p,origin,polar,0,kPPrimary,nt);
166 // Generated event header
168 AliGenEventHeader * header = new AliGenEventHeader();
169 header->SetNProduced(nt+1);
170 header->SetPrimaryVertex(fVertex);
171 AliRunLoader::GetRunLoader()->GetHeader()->SetGenEventHeader(header);
177 SetHighWaterMark(nt);
181 void AliGenExtFile::CdEventFile()
183 // CD back to the event file
184 (AliRunLoader::GetRunLoader())->CdGAFile();